The Canon 1DmkIV has a raft of custom functions. I am often asked
what I use - well after using the camera for some time now - these
are my current settings. Custom functions are a personal choice
but I think that for any wildlife photogapher that shoots in RAW
and uses evaluative metering these are a good place to start. Quite
a few functions are only relevant to jpeg shooting but have the
ability to slow the camera down so those are all set to off .

I am including a few lnks below which might also
be of interest in connection with this subject.These explain in
more detail what each custom function does.